iCloud Storage

Strictly speaking, in computing, capacity and storage are measured as units of 1024 - so 1024MB = 1GB and 1024GB = 1TB.

If you are interested to understand why counting is based upon 1024, this explanation from Wikipedia will help to explain the underlying concepts:

https://en.wikipedia.org/wiki/Megabyte

As mentioned by Niel , some manufacturers (Apple included) instead use decimal measurements instead of binary/hexidecimal - and effectively round-down to 1000s from 1024. As such, Apple’s marketing literature define 1000MB as 1GB - and 1000GB as 1TB.

When using decimal as the basis for measuring computer storage, you effectively have ~3% less storage.

1024; some manufacturers define it as 1000 when referring to an unit's internal storage.

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